Planned Parenthood President Cecile Richards said a series of undercover videos represent a "new low" in attacks against the women's health and abortion provider, in a Washington Post op-ed published late Wednesday.

Richards emphasized how Planned Parenthood provides a range of healthcare services to women around the country, including cancer screenings and contraception, in a defensive essay that pushed back against GOP efforts to cut off federal funding to her group. It also blasted the videos' makers for making "false and absurd assertions."

She reiterated that Planned Parenthood is doing nothing illegal by helping women donate aborted fetal tissue for medical research. The series of videos, released by the anti-abortion group Center for Medical Progress, features top Planned Parenthood officials discussing the practice with actors disguised as buyers of human tissue.

She also noted that she's already apologized for the "tone" taken by leaders in her organization as they discussed extracting fetal organs and being compensated for them.